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Gonna theorize how Necrozma works.
>Necrozma uses a new move to combine with Solgaleo/Lunala in your party. Acts like Necrozma has fainted
>Solgaleo/Lunala basically Mega evolve with Necrozma. 100 plus stats while getting Prism Armor
>If Solgaleo/Lunala faint, then Necrozma takes their place in battle. Any Stat boosts are kept.
>If you have both a Solgaleo and Lunala in your party, you can use the process again to evolve the other after the first one fainted